Final answer:
It is true that only unopened, prepackaged foods and certain condiments like ketchup and mustard in bottles can be reused, as they maintain their quality and prevent contamination. Food safety includes proper storage of leftovers, washing of fruits like melons to prevent bacteria transfer, and thorough handwashing to avoid foodborne diseases.
Step-by-step explanation:
The statement that you may re-serve only unopened, prepackaged food in good condition and you may also re-serve bottles of ketchup, mustard or other condiments is true. This is because prepackaged foods that have not been opened do not get exposed to contaminants that could lead to foodborne diseases. Moreover, condiment bottles, specially designed for multiple uses, are considered safe to re-serve as they generally remain safe from cross-contamination due to their packaging and typical usage.
Food safety practices dictate proper handling and storage of food to prevent foodborne illnesses. Cooked leftovers should be stored at temperatures below 4 degrees C (39 degrees F) or above 60 degrees C (140 degrees F) to inhibit bacterial growth. If left at room temperature (about 68 degrees F) for over two hours, these leftovers are no longer safe to consume, even after reheating, because harmful bacteria might have multiplied to dangerous levels. Washing melons before cutting is essential because bacteria on the rind can be transferred to the flesh when slicing the melon. It's also important to understand that foodborne diseases can cause serious health issues, which is why regular handwashing, using foods before their expiration dates, and proper cooking temperatures are vital for food safety.